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Issue 12, 2018
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Synthesis of well-dispersed Fe3O4 nanoparticles loaded on montmorillonite and sensitive colorimetric detection of H2O2 based on its peroxidase-like activity

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Abstract

In this study, a simple strategy for the preparation of Fe3O4 nanoparticles (NPs) loaded on montmorillonite as a support is reported. The Fe3O4–MMT nanocomposites (NCs) were demonstrated to possess peroxidase-like activity and could catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue oxidation product (oxTMB) in the presence of hydrogen peroxide. The obvious color change can be used to quantify the H2O2 concentration using UV-vis spectroscopy. In addition, the Fe3O4–MMT NCs exhibit enhanced peroxidase-like activity as compared to MMT or pure Fe3O4 NPs. Steady-state kinetics studies and a hydroxyl radical detecting assay were carried out to investigate the peroxidase-like activity and catalytic mechanism of these NCs. Under the optimized conditions, Fe3O4–MMT NCs are expected to be used as a good colorimetric biosensor for the detection of H2O2, which have a linear range from 5 × 10−5 M to 2 × 10−4 M with a detectable H2O2 concentration as low as 5.1 × 10−6 M. This sensor was also successfully applied to detect H2O2 in contact lens solution samples.

Graphical abstract: Synthesis of well-dispersed Fe3O4 nanoparticles loaded on montmorillonite and sensitive colorimetric detection of H2O2 based on its peroxidase-like activity

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Article information


Submitted
11 Mar 2018
Accepted
26 Apr 2018
First published
27 Apr 2018

New J. Chem., 2018,42, 9578-9587
Article type
Paper

Synthesis of well-dispersed Fe3O4 nanoparticles loaded on montmorillonite and sensitive colorimetric detection of H2O2 based on its peroxidase-like activity

K. Wu, X. Zhao, M. Chen, H. Zhang, Z. Liu, X. Zhang, X. Zhu and Q. Liu, New J. Chem., 2018, 42, 9578
DOI: 10.1039/C8NJ01190G

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